Siemens SIMATIC S5 Manual page 108

Machine Data, Modes and Traversing Programs
-2 -1 0 1 2
Figure 5-19. Reproducibility of the Reference Point for
5-36
Forward
5 9
-5 -2 -1
Reference Point Coordinate 0
Reference point switch
Encoder's zero mark
Location of the co-
ordinate zero point
when the reference
direction is "reverse"
Location of the co-
ordinate zero point
when the reference
direction is "forward"
1 2
EWA 4NEB 812 6057-02
IP 266